Zobrazeno 1 - 10
of 14
pro vyhledávání: '"M. Helmy A. Raouf"'
Autor:
M. Helmy A. Raouf, Rasha S. M. Ali
Publikováno v:
MAPAN. 34:267-271
In this paper, a new method is introduced for AC voltage ranges that are higher than 1 V by using the thermal converters. It can be used in laboratories in case of unavailability of the whole ranges of multiplier range resistors set. The introduced m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bb5ce03f96d0f354c40f7b2eb959739
https://doi.org/10.1007/s12647-019-00308-w
https://doi.org/10.1007/s12647-019-00308-w
Autor:
Rasha S. M. Ali, M. Helmy A. Raouf
Publikováno v:
MAPAN. 34:49-53
The main ratios of the Measurements International corporation (MI) 6010C automatic resistance bridge have been verified in this paper. The used method for verification is the exchanging method where the two resistors are interchanged, and then the of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::774541d632bb8a1d5815a899c3bedfbf
https://doi.org/10.1007/s12647-018-0294-0
https://doi.org/10.1007/s12647-018-0294-0
Publikováno v:
MAPAN. 32:199-205
Decade inductance boxes are widely used in electrical laboratories for calibration of instruments that measure inductance. The main aim of this paper is to construct a new inductance box providing a huge number of automated inductance steps, which ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09bfbb78cf3894de4fa91ed9b3b28332
https://doi.org/10.1007/s12647-017-0210-z
https://doi.org/10.1007/s12647-017-0210-z
Autor:
M. Helmy A. Raouf
Publikováno v:
Measurement. 101:206-210
Resistance boxes are used for calibration of devices that measure resistance at many electrical laboratories. In this research, a new automated Resistance Box (RB) has been presented that mainly consists of three decades. They have the same design, b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0df8470c88672b86f739663e5d818789
https://doi.org/10.1016/j.measurement.2017.01.038
https://doi.org/10.1016/j.measurement.2017.01.038
Autor:
Rasha S. M. Ali, M. Helmy A. Raouf
Publikováno v:
MAPAN. 32:39-42
Some improvements are presented in this paper to the previously introduced automated multi-range multipliers system. These multipliers; range resistors are selected automatically by using electronic relays controlled by a micro-controller that connec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43a6fae2178558c3e989321d5ac00798
https://doi.org/10.1007/s12647-016-0192-2
https://doi.org/10.1007/s12647-016-0192-2
Autor:
M. Helmy A. Raouf, Rasha S. M. Ali
Publikováno v:
MAPAN. 31:219-224
Some of traceability chains for the AC resistance measurements are based on AC/DC resistors. In this paper, performance of two types of them with different values has been investigated for their optimum utilization. Tinsley and Cambridge AC/DC resist
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::012666a52fa001651c975c74bcbad076
https://doi.org/10.1007/s12647-016-0175-3
https://doi.org/10.1007/s12647-016-0175-3
Publikováno v:
Measurement. 60:174-177
A programmable bridge has been constructed by using two arbitrary waveform generators and DVM as a null-detector for capacitance and resistance measurements. The generators are controlled by a software program which has been specially designed to ach
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f19d934d9bfd71599dd7b38b3b565555
https://doi.org/10.1016/j.measurement.2014.10.011
https://doi.org/10.1016/j.measurement.2014.10.011
Autor:
M. Helmy A. Raouf, Tamer Abd-Elrehim
Publikováno v:
Optics and Lasers in Engineering. 53:6-11
Low sensitivity in the detection of ultrasonic waves is a common problem in optical techniques, unlike in contact methods. To enhance the sensitivity limits for ultrasonic detection, a simulated optical system has been introduced in this study. The p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65ff34d2d6260b102cf94bcb1c7cb1b9
https://doi.org/10.1016/j.optlaseng.2013.08.003
https://doi.org/10.1016/j.optlaseng.2013.08.003
Autor:
M. Helmy A. Raouf, Tamer Abd-Elrehim
Publikováno v:
MAPAN. 29:1-8
Usually, ultrasonic detection is obtained by conventional contact techniques. In some critical cases such as working at hard environmental conditions (hot oven or nuclear field) or sensitive surfaces, then non-contact optical techniques should be use
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae5ecd377e89e374a741e95b746087d8
https://doi.org/10.1007/s12647-013-0054-0
https://doi.org/10.1007/s12647-013-0054-0
Publikováno v:
2016 Conference on Precision Electromagnetic Measurements (CPEM 2016).
In this paper, a new accurate capacitance box has been demonstrated to be used for calibration of capacitance measurement devices. 1666 different capacitance values, with minimum number of internal capacitive elements, could be produced by this new c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad1ad05984954c7e9daf42f3c7e055d4
https://doi.org/10.1109/cpem.2016.7540612
https://doi.org/10.1109/cpem.2016.7540612